Table of Content

Open Access Original Research

Risks Associated with the Use of Hydrogen as an Energy Carrier or Source

Received: 03 March 2022;  Published: 01 September 2022;  doi: 10.21926/jept.2203029


Hydrogen is a dangerous gas due to its low ignition energy, wide flammability range, promotion of the embrittlement of steel, and its high coefficient of permeation for polymers. The fracture toughness and failure elongation of pipe steels are strongly impacted by hydrogen embrittlement, whereas yie [...]

740 3591

Open Access Original Research

Study of Hydrogen Embrittlement in Pipelines and Nuclear Power Plants: Estimates for Durability

Received: 18 April 2022;  Published: 30 August 2022;  doi: 10.21926/jept.2203028


Due to the increasing need to further develop the world gas and oil industry and the increased public attention to clean energy sources, studying and preventing Hydrogen Induced Cracking is one of the main safety concerns in nuclear power plants, oil pipelines and platforms. In this article, the gro [...]

109 760

Open Access Review

Artificial Neural Networks and Gradient Boosted Machines Used for Regression to Evaluate Gasification Processes: A Review

Received: 18 February 2022;  Published: 18 August 2022;  doi: 10.21926/jept.2203027


Waste-to-Energy technologies have the potential to dramatically improve both the natural and human environment. One type of waste-to-energy technology that has been successful is gasification. There are numerous types of gasification processes and in order to drive understanding and the optimization [...]

98 880

Open Access Original Research

Incentivizing Alternative Fuel Vehicle Transactions: Analysis of Cash-for-Clunkers Transactions for New Alternative Fuel Vehicles

Received: 14 January 2022;  Published: 02 August 2022;  doi: 10.21926/jept.2203026


Monetary incentives to accelerate the transition of private vehicle fleets to zero emissions promote sustainability in the transportation sector. Clean Cars for America to incentivize transactions for new battery power vehicles is a program in furtherance of sustainable transportation go [...]

111 1005

Open Access Technical Note

From Food to Foot: The Energy and Carbon Flows of the Human Body at Walking and Cycling

Received: 10 March 2022;  Published: 18 July 2022;  doi: 10.21926/jept.2203025


The carbon footprint of motorized transport modes per unit length traveled encompasses the unit share of the vehicle lifetime emissions, that of the transport infrastructure, and those of the motor energy, considered both from “well to tank” and from “tank to wheel”. In the active modes of transport [...]

145 1302

Open Access Original Research

Numerical Study to Understand the Conservation of Hydrogen Through a Dynamic Fuel Supply System in Proton Exchange Membrane Fuel Cells (PEMFCs)

Received: 26 March 2022;  Published: 13 July 2022;  doi: 10.21926/jept.2203024


Reducing and conserving fuel usage is pivotal for any engineering system for the development of a sustainable energy solution. Proton exchange membrane fuel cells (PEMFCs) are one of the promising renewable energy systems that consume hydrogen as their source of fuel to generate electricity. This pa [...]

140 1303

Open Access Original Research

Surface Treatment of Flexible Barrier Film for Improved Stability of Organic Photovoltaic Mini Modules

Received: 07 March 2022;  Published: 04 July 2022;  doi: 10.21926/jept.2203023


The lifetime and stability of organic photovoltaics (OPVs) are the key factors that influence the technology used to scale up and commercialize OPVs. High-performing and reliable devices are used to fabricate the devices of choice. Materials and methods that can be used to prevent the degradation of [...]

140 1411

Open Access Original Research

Analysis of LoRa Transmission Delay on Dynamic Performance of Standalone DC Microgrids

Received: 18 April 2022;  Published: 26 June 2022;  doi: 10.21926/jept.2202022


One important aspect toward proper and stable functioning of a communication-based controlled microgrid is data transmission. Consequently, an analysis of the effect of data transmission delay is of significance for any chosen communication protocol. This paper focuses on the effect of employing LoR [...]

122 1290

Open Access Research Article

Controller Evaluation for Solar-Latent Thermal Energy Applications

Received: 17 April 2022;  Published: 09 June 2022;  doi: 10.21926/jept.2202021


In this study, the performance of a self-sufficient controller used for a solar-latent heat domestic hot water (DHW) production unit under real-world operating conditions was analyzed. The unit consists of a flat-plate solar collector and a latent heat storage tank. The controller is powered by a sm [...]

124 1341

Open Access Original Research

Improving the Engine Efficiency Using a New Combined Refrigeration Cycle for Low-Temperature Heat Source (Waste Heat Recovery)

Received: 19 April 2022;  Published: 08 June 2022;  doi: 10.21926/jept.2202020


Passenger and commercial internal combustion engines have relatively large dissipated thermal energy sources that can be used for initiating thermodynamic refrigeration cycles at low temperatures while improving engine efficiency. Researchers have focused on combined power-refrigeration cycles in pa [...]

133 1352